diff --git a/lib/stripe/api.ex b/lib/stripe/api.ex
index 15aa0dcd..4d45b59f 100644
--- a/lib/stripe/api.ex
+++ b/lib/stripe/api.ex
@@ -94,6 +94,12 @@ defmodule Stripe.API do
     |> Map.put("Content-Type", "multipart/form-data")
   end
 
+  @spec maybe_add_auth_header_oauth(headers, String.t(), String.t() | nil) :: headers
+  defp maybe_add_auth_header_oauth(headers, "deauthorize", api_key),
+    do: add_auth_header(headers, api_key)
+
+  defp maybe_add_auth_header_oauth(headers, _endpoint, _api_key), do: headers
+
   @spec add_auth_header(headers, String.t() | nil) :: headers
   defp add_auth_header(existing_headers, api_key) do
     api_key = fetch_api_key(api_key)
@@ -208,8 +214,9 @@ defmodule Stripe.API do
   @doc """
   A low level utility function to make an OAuth request to the Stripe API
   """
-  @spec oauth_request(method, String.t(), map) :: {:ok, map} | {:error, Stripe.Error.t()}
-  def oauth_request(method, endpoint, body) do
+  @spec oauth_request(method, String.t(), map, String.t() | nil) ::
+          {:ok, map} | {:error, Stripe.Error.t()}
+  def oauth_request(method, endpoint, body, api_key \\ nil) do
     base_url = "https://connect.stripe.com/oauth/"
     req_url = base_url <> endpoint
     req_body = Stripe.URI.encode_query(body)
@@ -217,6 +224,7 @@ defmodule Stripe.API do
     req_headers =
       %{}
       |> add_default_headers()
+      |> maybe_add_auth_header_oauth(endpoint, api_key)
       |> Map.to_list()
 
     req_opts =
diff --git a/test/stripe/api_test.exs b/test/stripe/api_test.exs
index 92e5d891..eb658feb 100644
--- a/test/stripe/api_test.exs
+++ b/test/stripe/api_test.exs
@@ -16,4 +16,27 @@ defmodule Stripe.APITest do
 
     assert Stripe.APIMock.oauth_request(:post, "www", %{body: "body"}) == :post
   end
+
+  test "oauth_request sets authorization header for deauthorize request" do
+    defmodule HackneyMock do
+      def request(_, _, headers, _, _) do
+        kv_headers =
+          headers
+          |> Enum.reduce(%{}, fn {k, v}, acc -> Map.put(acc, k, v) end)
+
+        {:ok, 200, headers, Poison.encode!(kv_headers)}
+      end
+    end
+
+    Application.put_env(:stripity_stripe, :http_module, HackneyMock)
+
+    {:ok, body} = Stripe.API.oauth_request(:post, "deauthorize", %{})
+    assert body["Authorization"] == "Bearer sk_test_123"
+
+    {:ok, body} = Stripe.API.oauth_request(:post, "deauthorize", %{}, "1234")
+    assert body["Authorization"] == "Bearer 1234"
+
+    {:ok, body} = Stripe.API.oauth_request(:post, "token", %{})
+    assert Map.keys(body) |> Enum.member?("Authorization") == false
+  end
 end